the.com/cutting room floor

means The fate of material—a scene, a joke, a verse—that was cut from the final version of something and discarded, often despite being good.

from Literal before it was figurative: in the age of physical film editing, editors would splice reels together with scissors and tape, and the unwanted strips of celluloid — trimmed scenes, outtakes, rejected takes — piled up on the floor of the editing room. By the mid-20th century, 'cutting room floor' had spliced itself into everyday language as shorthand for anything excised and left behind, long after actual film reels gave way to digital timelines.